MMON (Memory Monitor) is a background process that gathers memory statistics (snapshots) stores this information in the AWR (automatic workload repository). MMON is also responsible for issuing alerts for metrics that exceed their thresholds.
This process was introduced in Oracle 10g.
 Also see
- MMNL - MMON Lite process
- ASMM - The Automatic Shared Memory Management feature
- MMAN - Memory Manager process
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